Alkalization of the near-cathode layer in electrodeposition of nickel from a chloride electrode

Balakai, V. I.; Arzumanova, A. V.; Balakai, K. V.

doi:10.1134/s1070427210010143

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…As can be seen in Table 3, turbidity values for the two electro-Fenton methods actually increased after a few hours of treatment (as compared to the anodic oxidation method). This was most likely due to Fe 2+ agglomerates formed especially near the cathode surface where iron hydroxides can be produced (Balakai et al 2010). Furthermore, formation of a fine film in both electrodes is attributed to fouling caused by phenols present in the sample (Saravanan et al 2012).…”

Section: Organic Matter Removalmentioning

confidence: 98%

Discoloration and Organic Matter Removal from Coffee Wastewater by Electrochemical Advanced Oxidation Processes

Villanueva-Rodríguez

Bello-Mendoza

Wareham

et al. 2014

Water Air Soil Pollut

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The coffee agro-industry generates a large volume of wastewater that is notable for its high organic strength as well as its color content. Due to the seasonal nature of the harvest (3-4 months per year), this particular industrial waste needs a treatment method that is both reliable and fast (in terms of start-up time). As part of investigating a system capable of treating a coffee wastewater, this research evaluated four electrochemical advanced oxidation processes (EAOPs) using boron-doped diamond (BDD) electrodes. The processes were anodic oxidation (AO), anodic oxidation with electrogenerated H 2 O 2 (AO-H 2 O 2 ), electro-Fenton (EF), and photoelectro-Fenton (PEF). Experimental conditions were as follows: 40 mA cm −2 current density (all EAOPs), 0.3 mmol Fe 2+ L −1 (Fenton systems), 300 mL air min −1 (AO-H 2 O 2 , EF, PEF), and 500 μW cm −2 UV irradiation (photo-Fenton systems). The performance of the four EAOP treatment methods (in terms of color and organic carbon removal) was compared against two conventional chemical oxidation methods, namely, Fenton and photo-Fenton. The research indicated that the four EAOPs were better at removing color (89-93 %) and total organic carbon (TOC) (73-84 %) than the respective chemical Fenton (58 and 4.8 %) and photo-Fenton (61 and 7 %) methods. The trend in performance was as follows: AO-H 2 O 2 >AO>PEF≈EF. It appeared that the ferrous iron reagent formed a dark-colored complex with some coffee components, diminishing the effect of Fenton reactions. In addition, the dark color of the wastewater limited the effect of light in the UV-Fenton processes. Analysis showed that acceptable levels of Fe 2+ (0.3 mmol L −1 ) and energy (0.082-0.098 kWh g −1 TOC) were required by the EAOPs after 4-h treatment time. In conclusion, the use of electrochemical methods (equipped with BDD electrodes) seems a promising method for the effective treatment of coffee wastewaters.

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Section: Organic Matter Removalmentioning

confidence: 98%

Discoloration and Organic Matter Removal from Coffee Wastewater by Electrochemical Advanced Oxidation Processes

Villanueva-Rodríguez

Bello-Mendoza

Wareham

et al. 2014

Water Air Soil Pollut

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“…The result is an increase in the pH of a near-electrode layer. The elevated pH values may lead to the formation of insoluble hydroxide nickel compounds [7]. The introduction of such compounds to the cathode sediment has a negative impact on the quality of nickel coatings.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Research into effect of propionic and acrylic acids on the electrodeposition of nickel

Demchyshyna

Vargalyuk

Polonskyy

et al. 2017

EEJET

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“…The most commonly used protective deposit in industry is nickel. There are following directions of obtaining deposits containing a dispersed phase: deposits from suspension electrolytes obtained by the electrochemical method and containing the dispersed phase artificially introduced into the electrolyte; electrochemical deposits of electrolytes forming a dispersed phase during its preparation or electrolysis (also named colloid electrolytes) [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

The effect of nano-additives on the processes of electrodeposition of nickel precipitation

et al. 2020

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The article presents the results of investigates of the effect of ultrafine additives (zirconium diboride, silicon carbide, diamond) on the physical and mechanical properties of composite electrochemical nickel deposits obtained from colloid-electrolyte baths. It was revealed that the most effective nanostructured additives are zirconium diboride and ultrafine diamond. Current efficiency and potentiostatic researches shew mutual participation of finely dispersed nickel hydroxide compounds in the formation of a composite electrochemical deposits and dispersed phase of zirconium diboride or ultrafine diamond that are attendant in the solution or formed during electrolysis and introduced into the electrolyte. It is shown that the optimal values of internal tensions and microhardness are associated with the hardening of the nickel matrix together with various nano-dispersed additives that are included in the deposit. These deposits can be used as an alternative to chrome deposits on parts of machinery.

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Alkalization of the near-cathode layer in electrodeposition of nickel from a chloride electrode

Cited by 4 publications

References 1 publication

Discoloration and Organic Matter Removal from Coffee Wastewater by Electrochemical Advanced Oxidation Processes

Discoloration and Organic Matter Removal from Coffee Wastewater by Electrochemical Advanced Oxidation Processes

Research into effect of propionic and acrylic acids on the electrodeposition of nickel

The effect of nano-additives on the processes of electrodeposition of nickel precipitation

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